Source mass characterization in the ARIADNE axion experiment
Chloe Lohmeyer, Nancy Aggarwal, Asimina Arvanitaki, Alex Brown, Alan, Fang, Andrew A Geraci, Aharon Kapitulnik, Dongok Kim, Younggeun Kim, Inbum, Lee, Yong Ho Lee, Eli Levenson-Falk, Chen Yu Liu, Josh C Long, Sam Mumford,, Austin Reid, Allard Schnabel, Yannis Semertzidis
TL;DR
This paper characterizes magnetic noise sources, including impurities and Johnson noise, in the tungsten source mass used in the ARIADNE axion experiment, which aims to detect axion-mediated forces via NMR.
Contribution
It provides a detailed analysis of magnetic noise contributions from the source mass, improving understanding of background noise in precision axion detection experiments.
Findings
Magnetic noise from impurities in tungsten was quantified.
Johnson noise in tungsten source mass was characterized.
Results inform noise mitigation strategies for ARIADNE.
Abstract
The Axion Resonant InterAction Detection Experiment (ARIADNE) is a collaborative effort to search for the QCD axion using nuclear magnetic resonance (NMR), where the axion acts as a mediator of spin-dependent forces between an unpolarized tungsten source mass and a sample of polarized helium-3 gas. Since the experiment involves precision measurement of a small magnetization, it relies on limiting ordinary magnetic noise with superconducting magnetic shielding. In addition to the shielding, proper characterization of the noise level from other sources is crucial. We investigate one such noise source in detail: the magnetic noise due to impurities and Johnson noise in the tungsten source mass.
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